ERftLW: Shielding Cube

You direct a minute cube of force into the thick of battle, where it suddenly expands, slamming your enemy and protecting your allies. Make a ranged spell attack against one creature within range. If the attack hits, the target takes 2d6 force damage and its speed is reduced by half until the end of its next turn. Until its speed is no longer reduced, whenever the target makes an attack roll against a creature more than 5 feet away from it, it must roll a d4 and subtract the number rolled from the attack roll.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, each target takes an additional 1d6 force extra damage for each slot level above 1st.